Signoe to stephen p



(No Model.) 3 SheetsSheet 1.

H. B. PELDMANN. APPARATUS FOR SCREW THREADING TUBES.

No. 291,842. Patented Jam 8, 1884.

N PETERS, FIIelB-Lnlmgmpiwr, WJshmphm. uc.

' 3 Sheets-Sheet 3. H. B. FELDMANN.

APPARATUS FOR SCREW THREADING TUBES.

(No Model.)

No. 291,842. Patented Jan. 8, 1884.

WITNESSES:

N. PETERS. mm Llllwgmuhnr. Washmglen. 0.0.

lhvrrnn S'ra'rns Fnrnn'r rides.

HERMANN BERNHARD FELDMANN, OF PHILADELPHIA, PENNSYLVANIA, AS-

SIGN OR TO STEPHEN P. M. TASKER, CHARLES WHEELEB, AND T. W'ISTAB BROWVN, ALL OF SAME PLACE.

APPARATUS FOR SCREW THREADING TUBES.

SPECIFICATION forming part of Letters Patent No. 291,842, dated January 8, 1884.

Application filed July 21,1883. (No model.)

To aZZ whom it may concern:

Be it known that I, HERMANN Bnnnimnn FELDMAXN, of the city and county of Philadelphia, and State of Pennsylvania, have invented an Improved Apparatus for Cutting the Threads Upon and Cutting Off the Ends of Tubes, of which the following is a specification.

The object of my invention is the construction of an apparatus adapted to automatically cut the threads upon tubes or rods of metal, and also to diametrically sever or cut off the tube or rod at predetermined points in its length.

I 5 A preferred form of a convenient embodiment of my invention is hereinafter described and claimed.

I11 the drawings, Figure 1 is a side elevation of an apparatus conveniently embodying my improvements, a portion of the casing being broken away, to illustrate the application of the yoke to the diecarrying sleeve. Fig. 2 is a central longitudinal vertical sectional elevation through the apparatus of Fig. 1. Fig. 3 is an end view of the apparatus represented in Figs. 1 and 2, viewed fromthe right-hand side of Fig. 2, the cover-plate S being supposed removed. Fig. at is a vertical sectional elevation on a plane projected on the dbtted line a a of Fig. 2, viewed from the lefthand side of said Fig. 2. Fig. 5 is an end view of the thread-cutting die-stock represented in Figs. 1 and 2, sightbeing taken from the left-hand side of Fig. 2 in the plane of the dotted line I) b, the cap I and the cover-plate of the thread-cutting die-stock being removed. Fig. 6 is a vertical sectional elevational detail through the casing and die-carrying sleeve, section being supposed in the plane of theline c c of Fig. 1, and sight being taken from the left hand of said figure. Fig. 7 is a top plan detail of the slotted lever Q of the yoke and the handle which occasions the throw of the a bed-plate, B, provided with devices forholding a tube or rod concentrically within it, containing a die-carrying longitudinal ly-traveling sleeve, and also containing devices for rotating said sleeve and longitudinally moving it. The tube is introduced within the tubular casing and rigidly retained by the devices for holding it, and the die-carrying sleeve is then caused to rotate and travel longitudinally, so

as to bring the dies or cutters which it carries into contact with'the tube, in order to enable their operation upon it. Various contrivances 6o employed to enable the above operations form a part of the apparatus, and are hereinafter described and claimed. Both extremities of the hollow cylindriform casing are enlarged in diameter to form cylindriform sockets a and a respectively designed to contain the devices for imparting rotation to the die-carrying sleeve and for retaining the tube.

The devices for retaining the tube or rod rigidly in position concentrically with respect to the casing and die-carrying sleeve are represented in Figs. 2 and 3, and consist of a series, preferably three, of serrated and toothed segmental cams, D, of the shape represented in Fig. 3, hinged upon the pivots d, horizon- 7 5 tally projected from the casing and adapted to be simultaneously, as to their serrated segmental faces (1, converged or diverged through the instrumentality of a cam-actuating annulus, E, which is set within the socket a is provided with racks 0 upon its internal face, engaged with teeth (V, formed upon the semicircular outer extremities of the segmental cams D, and is also provided with a rack, e upon its exterior face, engaged with a worm, 8 5

f u )onaworni-shaft F 'ournaledtransversel 7 1 7 7 y in the casing. The tube G is gripped between the segmental serrated surfaces of the cams when the annulus, through the instrumentality of the worm-shaft F, is revolved in the direc- 0 tion of the arrow in Fig. 3, as will be well understood by reference to said figure.

C is the diecarrying sleeve, the same being a hollow or tubular metallic holder, of slightly less exterior diameter than the interior diam- 5' eter of the body of the casing A, and fitted therein. The outer extremity of the die-carrying sleeve is formed into a circumferential flange, c, and is equipped with. a thread-eutting die-stock, (designatedin the drawings by the letter H, and represented in Figs. 2 and 5.) This thread-cutting die-stock is of a character contrived by me, and is simply represented as a type of stock which is adapted to be secured to and carried by the die-carrying sleeve.

It is foreign to the purpose of this specification to minutely describe the stock-suffice it to say that it is provided with both threading-dies h and cutters M, and is clearly illustrated in the drawings.

Attached to the exterior face of the threadcutting die-stock H is a cap, I, adapted to contain any ordinary pattern of threading-die 13, which can be used, if desired, instead of the dies of the stock H. It is, in the form of apparatus represented, a device additional to the die-stock H; but it is to be understood that it can be applied directly to the flange c of the die-carrying sleeve, and the die-stock H be dispensed with.

J, Figs. 2 and 4, is a spur wheel, feathered upon the die-carrying sleeve and contained within the socket a of the casing A.

j is the feather upon which said spur-wheel runs, and which so connects it to the die-carrying sleeve that the sleeve is capable of longitudinally. moving with respect to the spurwheel, but is compelled to revolve with said spur-wheel.

K is a worm-shaft transversely journaled in the casing, and provided with a worm, k, which is engaged with the teeth of the spur-wheel J. Through the instrumentality of the worm-shaft K, rotation is imparted to the spur-wheel J, and thence to the die-carrying sleeve. The shaft K is preferably journaled so as to slide longitudinally in the casing, for the reason that when it is desired to revolve the die-carrying sleeve at a high rate of speed it is advisable to employ a bevel-gear, L, Fig. 1, one of the bevel-pinions of which is upon a shaft, Z, which also carries a toothed pinion, 1*, which is in constant engagement with the toothed spur-wheel J. \Vhen the worm-shaft K is driven for the actuation of the spur-wheel J, the pinion I and bevel-gear L run as idlers. WVhen, however, the spur-wheel J is driven from the bevel-gear, the worm-shaft K is to be slid to the side, so that its worm is is out of engagement with the teeth of the spur-wheel J.

The above devices are simply two devices for occasioning the actuation of the die-carrying sleeve. It would be competent for a mechanic to actuate said sleeve to a rotary moveinent by other contrivances than the above. I instance them, however, as convenient for the purpose.

In order to impart to the die carrying sleeve such a longitudinal movement as will occasion the threading-dies which it carries and revolves to cut a thread upon the st tionary tube within the casing, I have provided upon the casing a balance-lever, M, centrally pivoted and provided as to its extremities with segmental nuts on m the threads of which are of different pitch, which are adapted to slots or other openings in the casing, so that either the one or the other can be, through the tilt of the balance-lever, thrown down and projected within the interior hollow bore of the casing, and caused to engage with threads out upon the exterior of the dic'carrying sleeve. Two sets of threads are out upon said sleeve, and are respectively designated n M, being of pitch correspondent to the pitch of the threads upon the segmental nuts on Mi The speed of longitudinal movement of the sleeve through the casing is, as will be readily understood, governed by the above-described segmental nuts and threads, for when the nut of least pitch is engaged with its threads the longitudinal movement is of course slower than when the nut of greater pitch is engaged with its threads.

The balance-lever M is prolonged and bifurcated to embrace a shouldered thumb-nut, N, threaded upon a vertical stem, 0, erected from the casing, and by the set of said thumb-nut the position of the segmental nuts is governed, so that either one or the other nut can be thrown into engagement with the threads on the die-carrying sleeve; or both can be balanced so that neither engages with its threads, in which event the sleeve can be longitudinally moved through the instrumentality of a semicircular yoke, 1?, Figs. 1, 2, and 6, set in a circumferential channel, 1), formed in the die-car-' rying-sleeve,which yoke is controlled by aslotted lever, Q, pinned to the yoke by a pin, q, is journaled in the casing, and erected from a tubular stem, qflwhich is controlled for operation by a handle, q. hen it is desired to hold the die-carrying sleeve stationary against its longitudinal m ovement, the segmental nuts are balanced out of engagement with their threads, the handle q is thrown so as, through the medium of its connections with the yoke, to retract the sleeve up to the socket a, and angleiron R, Figs. 1 and 2, which is controlled by a screw-nut, r, threaded upon a vertical stem, TX, erected from the socket a, is screwed down until its lower extremity engages the circumferential flange 0 upon the die-carrying sleeve, and retains said sleeve fixedly against further movement. During the period of the above position of parts the cutting-01f dies in the thread-cutting die-stock are designed to be operated.

S is a cover-plate for the socket a and T a cover-plate for the socket c.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. In combination with a casing, the segmental serrated and toothed cams, the rackprovided annulus, and means for imparting a rotary movement to said annulus for the actuation of the cams, substantially as set forth.

2. In combination with the casing and with the die-carrying sleeve provided with circumferential threads on its exterior circumference,

IIO

the segmental nuts, the pivoted balance-lever, and means for operating said pivoted balance- 1ever,whereby either of saidnuts can be thrown into engagement with the threads on the sleeve,

or both retained out of engagement, substantially as set forth.

3. In an apparatus for threading rods or tubes, the combination, with the casing, the die-carrying sleeve provided with circumferential threads on its exterior circumference, the segmental nuts, and means for throwing either of said nuts into engagement with the threads 011 the sleeve, or for retaining them both out of engagement, of the yoke and means for occasioning the longitudinal movement of said yoke, whereby through the instrumentality of the segmental nuts the diecarrying sleeve can be slowly moved, and through the instrumentality of the yoke rapidly moved, substantially as set forth.

4. As a device for operating the segmental nuts, the pivoted balance-lever, in combination with the thumb-nut and stem upon the casing.

In testimony whereof I have hereunto signed my name this 2d day of July, A. D. 1883.

HERMANN BERNIIARD FELDMANN.

In presence of- W. O. STRAWBRIDGE, J. BONSALL TAYLOR. 

